[GHC] #7490: ghc-stage1 panic when building a cross-compiler or cross-building a compiler

[GHC]

#7490: ghc-stage1 panic when building a cross-compiler or cross-building a
compiler
----------------------------------+-----------------------------------------
    Reporter:  singpolyma         |       Owner:                     
        Type:  bug                |      Status:  new                
    Priority:  high               |   Milestone:  7.8.1              
   Component:  Compiler           |     Version:  7.7                
    Keywords:  cross-compilation  |          Os:  Unknown/Multiple   
Architecture:  Unknown/Multiple   |     Failure:  Building GHC failed
  Difficulty:  Unknown            |    Testcase:                     
   Blockedby:                     |    Blocking:                     
     Related:                     |  
----------------------------------+-----------------------------------------

Comment(by simonmar):

 A bit more info, after I elaborated the panic:

 {{{
 "inplace/bin/ghc-stage1" -static  -H64m -O0    -package-name integer-
 simple-0.1.1.0 -hide-all-packages -i -ilibraries/integer-simple/.
 -ilibraries/integer-simple/dist-install/build -ilibraries/integer-simple
 /dist-install/build/autogen -Ilibraries/integer-simple/dist-install/build
 -Ilibraries/integer-simple/dist-install/build/autogen -Ilibraries/integer-
 simple/.    -optP-include -optPlibraries/integer-simple/dist-
 install/build/autogen/cabal_macros.h -package ghc-prim-0.3.1.0  -package-
 name integer-simple -Wall -XHaskell98 -XCPP -XMagicHash -XBangPatterns
 -XUnboxedTuples -XForeignFunctionInterface -XUnliftedFFITypes
 -XNoImplicitPrelude -O  -no-user-package-db -rtsopts      -odir libraries
 /integer-simple/dist-install/build -hidir libraries/integer-simple/dist-
 install/build -stubdir libraries/integer-simple/dist-install/build -hisuf
 hi -osuf  o -hcsuf hc -c libraries/integer-simple/./GHC/Integer/Type.hs -o
 libraries/integer-simple/dist-install/build/GHC/Integer/Type.o

 Top level:
     Bad interface file: libraries/integer-simple/dist-
 install/build/GHC/Integer/Type.hi
         libraries/integer-simple/dist-install/build/GHC/Integer/Type.hi:
 openBinaryFile: does not exist (No such file or directory)
 ghc-stage1: panic! (the 'impossible' happened)
   (GHC version 7.7.20130116 for arm-unknown-linux):
         initTcForLookup
 }}}

 So we're trying to read `Type.hi` while compiling the same module.  This
 explains why it works the second time, after `Type.hi` has already been
 generated.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7490#comment:6>
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